Rajan Wilcox
If your line trimmer won't start even when it's filled with gas, a blocked, bent, or split fuel line could be the culprit. Fuel lines can degrade over time, becoming brittle and cracked, or even punctured. To replace the fuel line, you'll need to remove the fuel system cover, disconnect the spark plug wire, and pull out the old fuel lines. You can then push the new line through the small hole and out the large hole to the lid for the gas tank, before reattaching the gas tank and fuel lines to the carburetor. Finally, reconnect the spark plug wire, refill the gas tank, and test your trimmer.
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What You'll Learn
Removing the fuel system cover
To remove the cover, you must first remove any fasteners that affix the cover to the engine. This will allow you to access the carburetor and the fuel system. For example, in the case of the Ryobi 767rj trimmer, the fuel tank, carburetor, fuel lines, and carburetor mount plate will come off together.
Once the cover is removed, you will be able to see the carburetor and the fuel lines. The next step is to remove the fuel lines from the carburetor. This can be done using hemostat forceps or long needle-nosed pliers. Grasp the old fuel line inside the tank and carefully pull it out through the filler opening. If the fuel line breaks during this process, tip the trimmer and shake it to remove any remaining pieces.
After removing the fuel line, locate the fuel filter and plastic connector (if your model has one) and set them aside. The fuel filter is usually attached to the end of the fuel line inside the tank and can be removed using a hooked piece of wire or a straightened wire coat hanger.
At this point, you have successfully removed the fuel system cover and can proceed to replace the fuel lines or perform other necessary repairs. Remember to keep all fasteners and removed parts in a safe place to facilitate the reassembly process.
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Disconnecting the spark plug wire
Locate the Spark Plug: Before disconnecting the spark plug wire, you need to locate the spark plug itself. Typically, the spark plug is located at the back or side of the engine. It is usually covered by a plastic cover, which can be easily removed. Make sure the engine is turned off and completely cool before you begin.
Access the Spark Plug: Once you have located the spark plug, you need to access it. Some trimmers have a rubber boot or a cap covering the spark plug. Firmly grasp the rubber boot or the cap and pull it off. It is important to pull on the boot or cap itself, not the wire, as yanking on the wire can damage it.
Disconnect the Spark Plug Wire: Now you can disconnect the spark plug wire. Pull the wire straight off the spark plug. Be careful not to pull on the wire itself, as this can cause wire failure. Make sure to keep the wire at a distance so that it cannot make contact with the spark plug.
Inspect the Spark Plug: With the wire disconnected, you can now inspect the spark plug. Check for any signs of corrosion, carbon deposits, or damage. If the spark plug is black, corroded, or covered in carbon deposits, it may need to be replaced.
Clean if Necessary: If you notice any corrosion or dirt on the spark plug, clean it with a wire brush. Ensure that the area is free from debris before proceeding.
Store the Wire Safely: Once the spark plug wire is disconnected, set it aside in a safe place. Make sure it is away from the spark plug and cannot accidentally make contact.
Remember, handling the spark plug wire and spark plug requires care. Accidental contact or damage to the wire can cause issues with the trimmer's performance and may require costly replacements. Always refer to your trimmer's manual for specific instructions and safety precautions.
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Removing the fuel lines from the carburetor
Step 1: Prepare the Work Area
Before beginning any work on your line trimmer, it is important to prioritize your safety. Put on gloves and safety goggles to protect yourself from any fuel spillage or debris. Additionally, ensure that you have a well-ventilated work area to prevent the buildup of gasoline fumes.
Step 2: Disconnect the Spark Plug
Locate the spark plug wire and carefully disconnect it from the spark plug. Keep the wire away from the spark plug to avoid any accidental contact. This step is crucial for safety, as it prevents the engine from accidentally turning on during the maintenance process.
Step 3: Drain the Fuel Tank
Remove the fuel cap and carefully pour the gasoline from the tank into an approved storage container. This step ensures that you don't accidentally spill fuel when handling the trimmer. It also gives you an opportunity to inspect the fuel for any signs of degradation, such as discoloration or a strong odour, which may indicate the need for a fuel change.
Step 4: Access the Carburetor
The next step is to access the carburetor, which is usually affixed to the engine against a plate, often called the carburetor choke plate. Remove any fasteners or screws that hold the fuel system cover in place, allowing you to reach the carburetor and its associated fuel lines.
Step 5: Release the Throttle Cable
Before removing the fuel lines, you need to release the throttle cable from the carburetor. Simply lift and tilt the carburetor to release the cable. On some trimmers, the throttle cable threads through the carburetor choke plate, so you may need to guide it through the appropriate hole.
Step 6: Remove the Fuel Assembly
At this point, you should be able to remove the fuel assembly, which includes the fuel tank, carburetor plate, and carburetor. They are usually still connected by the fuel lines, so be careful not to disturb the arrangement until you are ready to work on the fuel lines specifically.
Step 7: Inspect and Diagram the Fuel Line Setup
Before removing the fuel lines from the carburetor, take a moment to inspect and diagram their setup. Note the connections between the fuel lines, the carburetor, the primer bulb (if present), and the fuel tank. This step will help you immensely when it comes to reinstalling the new fuel lines, ensuring that you don't accidentally mix up the connections.
Step 8: Remove the Old Fuel Lines
Finally, you can remove the old fuel lines from the carburetor. You can usually do this by hand or with the help of needle-nose pliers. If the lines are particularly stubborn, you may need to use a small screwdriver to carefully pry them off without damaging the fittings. Be cautious when removing the lines, as some fuel may spill or leak out.
By following these steps, you can safely and effectively remove the fuel lines from the carburetor of your line trimmer. Remember to have a diagram of the fuel line setup to refer to when installing the new fuel lines, ensuring a smooth and accurate reassembly process.
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Reinstalling the throttle cable
First, disconnect the throttle cable from the carburetor. This is done by using a lift-and-tilt motion. Next, thread the throttle linkage (on the carburetor-side of the trimmer) through the large opening on the carburetor mounting plate. Pull the throttle cable (from the handle-side of the trimmer) through the engine housing and away from the engine.
Now, pass the new throttle cable through the openings in the engine housing. Pass the throttle cable linkage (on the end) through the large hole in the carburetor mounting plate. There is a small slit along the bottom of the plastic tube on the carburetor mounting plate (just under the fuel tank). Tuck/slide the metal portion of the throttle cable (not the cable housing) into this slit. Push the cable housing into the plastic tube.
After this, attach the new throttle cable to the throttle linkage on the carburetor. Install the carburetor mounting screws onto the choke plate and lever. Secure the carburetor (and choke plate) to the engine with the screws. Note that the choke lever and the wavy washer must be properly aligned before tightening the upper screw.
Now, reinstall the rear cover onto the engine. Secure the rear cover with the screws. Then, reinstall the trigger (and lower throttle cable). Pass the new throttle cable through the opening on the lower half of the trigger housing. Align the throttle cable with the groove inside the trigger housing. Connect the throttle linkage to the throttle trigger. The throttle linkage should sit on top of the trigger assembly when the two components are placed into the handle. Install the trigger spring onto the throttle trigger.
Finally, reinstall the top half of the throttle housing. Verify that the throttle trigger, spring and cable are neatly aligned within the housing. Install the top half of the throttle housing and secure it with the screws.
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Refuelling the tank and checking for leaks
Before refuelling, it is important to ensure that the fuel tank is clean and free of any debris. This is important to prevent any blockages in the fuel line. To do this, remove the fuel cap and empty the fuel tank into an approved storage container. Use a funnel to prevent spills and pour the fuel into the tank. If you are using a universal fuel line, cut the tubing to the appropriate length and replace the old pieces.
When refuelling, it is important to use the correct type and amount of fuel for your specific trimmer. Refer to the user manual for the recommended fuel type and mix ratio. Fill the tank with the fuel mix, being careful not to overfill it. Once the tank is filled, securely replace the fuel cap.
After refuelling, it is crucial to check for any leaks. Leaking fuel could indicate a cracked or damaged fuel line, which needs to be replaced. Inspect the fuel lines for any signs of damage, such as discolouration, brittleness, or cracks. If the fuel lines appear intact, reconnect the spark plug wire to the spark plug and attempt to start the trimmer. If the trimmer starts and runs smoothly, the repair is likely successful and no leaks are present.
If you suspect a leak, you can use soapy water to identify the source. Turn off the trimmer and apply soapy water to the fuel lines and connections. Bubbles forming in a specific area indicate a leak. If a leak is detected, turn off the trimmer and disconnect the spark plug wire. Do not operate the trimmer until the leak is properly addressed and the fuel lines are securely connected.
To prevent leaks and ensure optimal performance, regularly inspect and maintain your trimmer's fuel lines. Check the fuel lines periodically for any signs of wear or damage. Replace the fuel lines as necessary, following the steps outlined above.
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Frequently asked questions
Your fuel line may need to be replaced if it has discoloured, become brittle, or you can see cracks. Other signs include the primer bulb not sealing properly, the engine not revving up properly, and leaking fuel.
Always wear gloves and safety goggles when working with a string trimmer. Before you start, remove the spark plug wire from the spark plug and keep it at a distance. Pour the gas from the string trimmer's fuel tank into a gas can using a funnel to prevent spills.
First, remove the fuel system cover and any fasteners that affix the cover to the engine. Then, disconnect the fuel lines from the carburetor and remove them from the tank. You may need to use needle-nose pliers or a small screwdriver for this step.
Cut the ends of the new fuel lines at an angle and push them into the correct holes in the tank. Reinstall the throttle cable and affix the carburetor to the mount plate. Reinstall the fuel system cover.
It's important to refer to the specific instructions for your model of trimmer, as the process may vary slightly. Always put safety first when working with a string trimmer. If you are unsure about any steps, ask an expert for help.
